60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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// Date: Fri Jul 14 11:29:21 CST 2017
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#ifndef BVAR_SCOPED_TIMER_H
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#define BVAR_SCOPED_TIMER_H
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#include "butil/time.h"
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// Accumulate microseconds spent by scopes into bvar, useful for debugging.
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// Example:
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// bvar::Adder<int64_t> g_function1_spent;
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// ...
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// void function1() {
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// // time cost by function1() will be sent to g_spent_time when
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// // the function returns.
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// bvar::ScopedTimer tm(g_function1_spent);
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// ...
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// }
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// To check how many microseconds the function spend in last second, you
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// can wrap the bvar within PerSecond and make it viewable from /vars
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// bvar::PerSecond<bvar::Adder<int64_t> > g_function1_spent_second(
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// "function1_spent_second", &g_function1_spent);
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namespace bvar{
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template <typename T>
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class ScopedTimer {
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public:
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explicit ScopedTimer(T& bvar)
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: _start_time(butil::cpuwide_time_us()), _bvar(&bvar) {}
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~ScopedTimer() {
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*_bvar << (butil::cpuwide_time_us() - _start_time);
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}
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void reset() { _start_time = butil::cpuwide_time_us(); }
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private:
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DISALLOW_COPY_AND_ASSIGN(ScopedTimer);
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int64_t _start_time;
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T* _bvar;
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};
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} // namespace bvar
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#endif //BVAR_SCOPED_TIMER_H
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